package com.order.aspect;


import com.order.annotation.AutoFill;
import com.order.constant.AutoFillConstant;
import com.order.context.BaseContext;
import com.order.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段填充处理逻辑
 */

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */

    @Pointcut("execution(* com.order.mapper.*.*(..)) && @annotation(com.order.annotation.AutoFill)")
    public void autoFillPointCut(){

    }

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */

    @Before("autoFillPointCut()")
    public  void autoFill(JoinPoint joinPoint){

        log.info("开始进行公共字段的自动填充..");

        //获取当前拦截的方法上数据库的操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();     //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);    //获得方法上的注解对象
        OperationType operationType = autoFill.value();     //获取数据库操作类型

        //获取被拦截的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }

        Object entity = args[0];


        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();

        //根据不同操作类型为属性赋值
        if(operationType == OperationType.INSERT){

            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }


        }else if(operationType == OperationType.UPDATE){

            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

}
